[linux-block.git] / net / mac80211 / mesh_ps.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
 * Copyright 2012-2013, cozybit Inc.
 * Copyright (C) 2021 Intel Corporation
 * Copyright (C) 2023 Intel Corporation
 */

#include "mesh.h"
#include "wme.h"


/* mesh PS management */

/**
 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
 * @sta: the station to get the frame for
 */
static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_hdr *nullfunc; /* use 4addr header */
	struct sk_buff *skb;
	int size = sizeof(*nullfunc);
	__le16 fc;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
	if (!skb)
		return NULL;
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = skb_put(skb, size);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
	ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
				      sdata->vif.addr);
	nullfunc->frame_control = fc;
	nullfunc->duration_id = 0;
	nullfunc->seq_ctrl = 0;
	/* no address resolution for this frame -> set addr 1 immediately */
	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
	skb_put_zero(skb, 2); /* append QoS control field */
	ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);

	return skb;
}

/**
 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
 * @sta: the station to send to
 */
static void mps_qos_null_tx(struct sta_info *sta)
{
	struct sk_buff *skb;

	skb = mps_qos_null_get(sta);
	if (!skb)
		return;

	mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
		sta->sta.addr);

	/* don't unintentionally start a MPSP */
	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
		u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);

		qc[0] |= IEEE80211_QOS_CTL_EOSP;
	}

	ieee80211_tx_skb(sta->sdata, skb);
}

/**
 * ieee80211_mps_local_status_update - track status of local link-specific PMs
 *
 * @sdata: local mesh subif
 *
 * sets the non-peer power mode and triggers the driver PS (re-)configuration
 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
 */
u64 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct sta_info *sta;
	bool peering = false;
	int light_sleep_cnt = 0;
	int deep_sleep_cnt = 0;
	u64 changed = 0;
	enum nl80211_mesh_power_mode nonpeer_pm;

	rcu_read_lock();
	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
		if (sdata != sta->sdata)
			continue;

		switch (sta->mesh->plink_state) {
		case NL80211_PLINK_OPN_SNT:
		case NL80211_PLINK_OPN_RCVD:
		case NL80211_PLINK_CNF_RCVD:
			peering = true;
			break;
		case NL80211_PLINK_ESTAB:
			if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
				light_sleep_cnt++;
			else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
				deep_sleep_cnt++;
			break;
		default:
			break;
		}
	}
	rcu_read_unlock();

	/*
	 * Set non-peer mode to active during peering/scanning/authentication
	 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
	 * deep sleep if the local STA is in light or deep sleep towards at
	 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
	 * user-configured default value.
	 */
	if (peering) {
		mps_dbg(sdata, "setting non-peer PM to active for peering\n");
		nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
	} else if (light_sleep_cnt || deep_sleep_cnt) {
		mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
		nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
	} else {
		mps_dbg(sdata, "setting non-peer PM to user value\n");
		nonpeer_pm = ifmsh->mshcfg.power_mode;
	}

	/* need update if sleep counts move between 0 and non-zero */
	if (ifmsh->nonpeer_pm != nonpeer_pm ||
	    !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
	    !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
		changed = BSS_CHANGED_BEACON;

	ifmsh->nonpeer_pm = nonpeer_pm;
	ifmsh->ps_peers_light_sleep = light_sleep_cnt;
	ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;

	return changed;
}

/**
 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
 *
 * @sta: mesh STA
 * @pm: the power mode to set
 * Return BSS_CHANGED_BEACON if a beacon update is in order.
 */
u64 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
				   enum nl80211_mesh_power_mode pm)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;

	if (sta->mesh->local_pm == pm)
		return 0;

	mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
		pm, sta->sta.addr);

	sta->mesh->local_pm = pm;

	/*
	 * announce peer-specific power mode transition
	 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
	 */
	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
		mps_qos_null_tx(sta);

	return ieee80211_mps_local_status_update(sdata);
}

/**
 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
 *
 * @sdata: local mesh subif
 * @sta: mesh STA
 * @hdr: 802.11 frame header
 *
 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
 *
 * NOTE: sta must be given when an individually-addressed QoS frame header
 * is handled, for group-addressed and management frames it is not used
 */
void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
				   struct sta_info *sta,
				   struct ieee80211_hdr *hdr)
{
	enum nl80211_mesh_power_mode pm;
	u8 *qc;

	if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
		    ieee80211_is_data_qos(hdr->frame_control) &&
		    !sta))
		return;

	if (is_unicast_ether_addr(hdr->addr1) &&
	    ieee80211_is_data_qos(hdr->frame_control) &&
	    sta->mesh->plink_state == NL80211_PLINK_ESTAB)
		pm = sta->mesh->local_pm;
	else
		pm = sdata->u.mesh.nonpeer_pm;

	if (pm == NL80211_MESH_POWER_ACTIVE)
		hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
	else
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);

	if (!ieee80211_is_data_qos(hdr->frame_control))
		return;

	qc = ieee80211_get_qos_ctl(hdr);

	if ((is_unicast_ether_addr(hdr->addr1) &&
	     pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
	    (is_multicast_ether_addr(hdr->addr1) &&
	     sdata->u.mesh.ps_peers_deep_sleep > 0))
		qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
	else
		qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
}

/**
 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
 *
 * @sta: mesh STA
 *
 * called after change of peering status or non-peer/peer-specific power mode
 */
void ieee80211_mps_sta_status_update(struct sta_info *sta)
{
	enum nl80211_mesh_power_mode pm;
	bool do_buffer;

	/* For non-assoc STA, prevent buffering or frame transmission */
	if (sta->sta_state < IEEE80211_STA_ASSOC)
		return;

	/*
	 * use peer-specific power mode if peering is established and the
	 * peer's power mode is known
	 */
	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
	    sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
		pm = sta->mesh->peer_pm;
	else
		pm = sta->mesh->nonpeer_pm;

	do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);

	/* clear the MPSP flags for non-peers or active STA */
	if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
		clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
		clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
	} else if (!do_buffer) {
		clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
	}

	/* Don't let the same PS state be set twice */
	if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
		return;

	if (do_buffer) {
		set_sta_flag(sta, WLAN_STA_PS_STA);
		atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
		mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
			sta->sta.addr);
	} else {
		ieee80211_sta_ps_deliver_wakeup(sta);
	}
}

static void mps_set_sta_peer_pm(struct sta_info *sta,
				struct ieee80211_hdr *hdr)
{
	enum nl80211_mesh_power_mode pm;
	u8 *qc = ieee80211_get_qos_ctl(hdr);

	/*
	 * Test Power Management field of frame control (PW) and
	 * mesh power save level subfield of QoS control field (PSL)
	 *
	 * | PM | PSL| Mesh PM |
	 * +----+----+---------+
	 * | 0  |Rsrv|  Active |
	 * | 1  | 0  |  Light  |
	 * | 1  | 1  |  Deep   |
	 */
	if (ieee80211_has_pm(hdr->frame_control)) {
		if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
			pm = NL80211_MESH_POWER_DEEP_SLEEP;
		else
			pm = NL80211_MESH_POWER_LIGHT_SLEEP;
	} else {
		pm = NL80211_MESH_POWER_ACTIVE;
	}

	if (sta->mesh->peer_pm == pm)
		return;

	mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
		sta->sta.addr, pm);

	sta->mesh->peer_pm = pm;

	ieee80211_mps_sta_status_update(sta);
}

static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
				   struct ieee80211_hdr *hdr)
{
	enum nl80211_mesh_power_mode pm;

	if (ieee80211_has_pm(hdr->frame_control))
		pm = NL80211_MESH_POWER_DEEP_SLEEP;
	else
		pm = NL80211_MESH_POWER_ACTIVE;

	if (sta->mesh->nonpeer_pm == pm)
		return;

	mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
		sta->sta.addr, pm);

	sta->mesh->nonpeer_pm = pm;

	ieee80211_mps_sta_status_update(sta);
}

/**
 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
 *
 * @sta: STA info that transmitted the frame
 * @hdr: IEEE 802.11 (QoS) Header
 */
void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
				    struct ieee80211_hdr *hdr)
{
	if (is_unicast_ether_addr(hdr->addr1) &&
	    ieee80211_is_data_qos(hdr->frame_control)) {
		/*
		 * individually addressed QoS Data/Null frames contain
		 * peer link-specific PS mode towards the local STA
		 */
		mps_set_sta_peer_pm(sta, hdr);

		/* check for mesh Peer Service Period trigger frames */
		ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
					       sta, false, false);
	} else {
		/*
		 * can only determine non-peer PS mode
		 * (see IEEE802.11-2012 8.2.4.1.7)
		 */
		mps_set_sta_nonpeer_pm(sta, hdr);
	}
}


/* mesh PS frame release */

static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	struct ieee80211_tx_info *info;
	u8 *qc;

	skb = mps_qos_null_get(sta);
	if (!skb)
		return;

	nullfunc = (struct ieee80211_hdr *) skb->data;
	if (!eosp)
		nullfunc->frame_control |=
				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
	/*
	 * | RSPI | EOSP |  MPSP triggering   |
	 * +------+------+--------------------+
	 * |  0   |  0   | local STA is owner |
	 * |  0   |  1   | no MPSP (MPSP end) |
	 * |  1   |  0   | both STA are owner |
	 * |  1   |  1   | peer STA is owner  | see IEEE802.11-2012 13.14.9.2
	 */
	qc = ieee80211_get_qos_ctl(nullfunc);
	if (rspi)
		qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
	if (eosp)
		qc[0] |= IEEE80211_QOS_CTL_EOSP;

	info = IEEE80211_SKB_CB(skb);

	info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
		       IEEE80211_TX_CTL_REQ_TX_STATUS;

	mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
		rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);

	ieee80211_tx_skb(sdata, skb);
}

/**
 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
 * @sta: the station to handle
 * @frames: the frame list to append to
 *
 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
 * flag in the QoS Control field. In case the current tailing frame is not a
 * QoS Data frame, append a QoS Null to carry the flag.
 */
static void mpsp_qos_null_append(struct sta_info *sta,
				 struct sk_buff_head *frames)
{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_tx_info *info;

	if (ieee80211_is_data_qos(hdr->frame_control))
		return;

	new_skb = mps_qos_null_get(sta);
	if (!new_skb)
		return;

	mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
		sta->sta.addr);
	/*
	 * This frame has to be transmitted last. Assign lowest priority to
	 * make sure it cannot pass other frames when releasing multiple ACs.
	 */
	new_skb->priority = 1;
	skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
	ieee80211_set_qos_hdr(sdata, new_skb);

	info = IEEE80211_SKB_CB(new_skb);
	info->control.vif = &sdata->vif;
	info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;

	__skb_queue_tail(frames, new_skb);
}

/**
 * mps_frame_deliver - transmit frames during mesh powersave
 *
 * @sta: STA info to transmit to
 * @n_frames: number of frames to transmit. -1 for all
 */
static void mps_frame_deliver(struct sta_info *sta, int n_frames)
{
	struct ieee80211_local *local = sta->sdata->local;
	int ac;
	struct sk_buff_head frames;
	struct sk_buff *skb;
	bool more_data = false;

	skb_queue_head_init(&frames);

	/* collect frame(s) from buffers */
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
		while (n_frames != 0) {
			skb = skb_dequeue(&sta->tx_filtered[ac]);
			if (!skb) {
				skb = skb_dequeue(
					&sta->ps_tx_buf[ac]);
				if (skb)
					local->total_ps_buffered--;
			}
			if (!skb)
				break;
			n_frames--;
			__skb_queue_tail(&frames, skb);
		}

		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
			more_data = true;
	}

	/* nothing to send? -> EOSP */
	if (skb_queue_empty(&frames)) {
		mpsp_trigger_send(sta, false, true);
		return;
	}

	/* in a MPSP make sure the last skb is a QoS Data frame */
	if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
		mpsp_qos_null_append(sta, &frames);

	mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
		skb_queue_len(&frames), sta->sta.addr);

	/* prepare collected frames for transmission */
	skb_queue_walk(&frames, skb) {
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
		struct ieee80211_hdr *hdr = (void *) skb->data;

		/*
		 * Tell TX path to send this frame even though the
		 * STA may still remain is PS mode after this frame
		 * exchange.
		 */
		info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;

		if (more_data || !skb_queue_is_last(&frames, skb))
			hdr->frame_control |=
				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
		else
			hdr->frame_control &=
				cpu_to_le16(~IEEE80211_FCTL_MOREDATA);

		if (skb_queue_is_last(&frames, skb) &&
		    ieee80211_is_data_qos(hdr->frame_control)) {
			u8 *qoshdr = ieee80211_get_qos_ctl(hdr);

			/* MPSP trigger frame ends service period */
			*qoshdr |= IEEE80211_QOS_CTL_EOSP;
			info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
		}
	}

	ieee80211_add_pending_skbs(local, &frames);
	sta_info_recalc_tim(sta);
}

/**
 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
 *
 * @qc: QoS Control field
 * @sta: peer to start a MPSP with
 * @tx: frame was transmitted by the local STA
 * @acked: frame has been transmitted successfully
 *
 * NOTE: active mode STA may only serve as MPSP owner
 */
void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
				    bool tx, bool acked)
{
	u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
	u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;

	if (tx) {
		if (rspi && acked)
			set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);

		if (eosp)
			clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
		else if (acked &&
			 test_sta_flag(sta, WLAN_STA_PS_STA) &&
			 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
			mps_frame_deliver(sta, -1);
	} else {
		if (eosp)
			clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
		else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
			set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);

		if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
			mps_frame_deliver(sta, -1);
	}
}

/**
 * ieee80211_mps_frame_release - release frames buffered due to mesh power save
 *
 * @sta: mesh STA
 * @elems: IEs of beacon or probe response
 *
 * For peers if we have individually-addressed frames buffered or the peer
 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
 * trigger frames. If the neighbour STA is not a peer, only send single frames.
 */
void ieee80211_mps_frame_release(struct sta_info *sta,
				 struct ieee802_11_elems *elems)
{
	int ac, buffer_local = 0;
	bool has_buffered = false;

	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
		has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
						   sta->mesh->aid);

	if (has_buffered)
		mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
			sta->sta.addr);

	/* only transmit to PS STA with announced, non-zero awake window */
	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
	    (!elems->awake_window || !get_unaligned_le16(elems->awake_window)))
		return;

	if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
					skb_queue_len(&sta->tx_filtered[ac]);

	if (!has_buffered && !buffer_local)
		return;

	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
		mpsp_trigger_send(sta, has_buffered, !buffer_local);
	else
		mps_frame_deliver(sta, 1);
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
3f52b7e3 MP	2	/*
	3	* Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
	4	* Copyright 2012-2013, cozybit Inc.
b9731062	5	* Copyright (C) 2021 Intel Corporation
15ddba5f	6	* Copyright (C) 2023 Intel Corporation
3f52b7e3 MP	7	*/
	8
	9	#include "mesh.h"
	10	#include "wme.h"
	11
	12
	13	/* mesh PS management */
	14
	15	/**
	16	* mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
21439b65	17	* @sta: the station to get the frame for
3f52b7e3 MP	18	*/
	19	static struct sk_buff mps_qos_null_get(struct sta_info sta)
	20	{
	21	struct ieee80211_sub_if_data *sdata = sta->sdata;
	22	struct ieee80211_local *local = sdata->local;
	23	struct ieee80211_hdr nullfunc; / use 4addr header */
	24	struct sk_buff *skb;
	25	int size = sizeof(*nullfunc);
	26	__le16 fc;
	27
	28	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
	29	if (!skb)
	30	return NULL;
	31	skb_reserve(skb, local->hw.extra_tx_headroom);
	32
4df864c1	33	nullfunc = skb_put(skb, size);
3f52b7e3 MP	34	fc = cpu_to_le16(IEEE80211_FTYPE_DATA \| IEEE80211_STYPE_QOS_NULLFUNC);
	35	ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
	36	sdata->vif.addr);
	37	nullfunc->frame_control = fc;
	38	nullfunc->duration_id = 0;
864a6040	39	nullfunc->seq_ctrl = 0;
3f52b7e3 MP	40	/* no address resolution for this frame -> set addr 1 immediately */
3f52b7e3 MP	41	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
b080db58	42	skb_put_zero(skb, 2); /* append QoS control field */
3f52b7e3 MP	43	ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
	44
	45	return skb;
	46	}
	47
	48	/**
	49	* mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
21439b65	50	* @sta: the station to send to
3f52b7e3 MP	51	*/
	52	static void mps_qos_null_tx(struct sta_info *sta)
	53	{
	54	struct sk_buff *skb;
	55
	56	skb = mps_qos_null_get(sta);
	57	if (!skb)
	58	return;
	59
	60	mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
	61	sta->sta.addr);
	62
	63	/* don't unintentionally start a MPSP */
	64	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
	65	u8 qc = ieee80211_get_qos_ctl((void ) skb->data);
	66
	67	qc[0] \|= IEEE80211_QOS_CTL_EOSP;
	68	}
	69
	70	ieee80211_tx_skb(sta->sdata, skb);
	71	}
	72
	73	/**
	74	* ieee80211_mps_local_status_update - track status of local link-specific PMs
	75	*
	76	* @sdata: local mesh subif
	77	*
	78	* sets the non-peer power mode and triggers the driver PS (re-)configuration
39886b61	79	* Return BSS_CHANGED_BEACON if a beacon update is necessary.
3f52b7e3	80	*/
15ddba5f	81	u64 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
3f52b7e3 MP	82	{
	83	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	84	struct sta_info *sta;
	85	bool peering = false;
	86	int light_sleep_cnt = 0;
	87	int deep_sleep_cnt = 0;
15ddba5f	88	u64 changed = 0;
39886b61	89	enum nl80211_mesh_power_mode nonpeer_pm;
3f52b7e3 MP	90
	91	rcu_read_lock();
	92	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
	93	if (sdata != sta->sdata)
	94	continue;
	95
433f5bc1	96	switch (sta->mesh->plink_state) {
3f52b7e3 MP	97	case NL80211_PLINK_OPN_SNT:
	98	case NL80211_PLINK_OPN_RCVD:
	99	case NL80211_PLINK_CNF_RCVD:
	100	peering = true;
	101	break;
	102	case NL80211_PLINK_ESTAB:
433f5bc1	103	if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
3f52b7e3	104	light_sleep_cnt++;
433f5bc1	105	else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
3f52b7e3 MP	106	deep_sleep_cnt++;
	107	break;
	108	default:
	109	break;
	110	}
	111	}
	112	rcu_read_unlock();
	113
	114	/*
	115	* Set non-peer mode to active during peering/scanning/authentication
	116	* (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
	117	* deep sleep if the local STA is in light or deep sleep towards at
	118	* least one mesh peer (see 13.14.3.1). Otherwise, set it to the
	119	* user-configured default value.
	120	*/
	121	if (peering) {
	122	mps_dbg(sdata, "setting non-peer PM to active for peering\n");
39886b61	123	nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
3f52b7e3 MP	124	} else if (light_sleep_cnt \|\| deep_sleep_cnt) {
3f52b7e3 MP	125	mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
39886b61	126	nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
3f52b7e3 MP	127	} else {
3f52b7e3 MP	128	mps_dbg(sdata, "setting non-peer PM to user value\n");
39886b61	129	nonpeer_pm = ifmsh->mshcfg.power_mode;
3f52b7e3 MP	130	}
3f52b7e3 MP	131
39886b61 TP	132	/* need update if sleep counts move between 0 and non-zero */
	133	if (ifmsh->nonpeer_pm != nonpeer_pm \|\|
	134	!ifmsh->ps_peers_light_sleep != !light_sleep_cnt \|\|
	135	!ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
	136	changed = BSS_CHANGED_BEACON;
	137
	138	ifmsh->nonpeer_pm = nonpeer_pm;
3f52b7e3 MP	139	ifmsh->ps_peers_light_sleep = light_sleep_cnt;
3f52b7e3 MP	140	ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
39886b61 TP	141
39886b61 TP	142	return changed;
3f52b7e3 MP	143	}
	144
	145	/**
	146	* ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
	147	*
	148	* @sta: mesh STA
	149	* @pm: the power mode to set
39886b61	150	* Return BSS_CHANGED_BEACON if a beacon update is in order.
3f52b7e3	151	*/
15ddba5f	152	u64 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
39886b61	153	enum nl80211_mesh_power_mode pm)
3f52b7e3 MP	154	{
	155	struct ieee80211_sub_if_data *sdata = sta->sdata;
	156
433f5bc1	157	if (sta->mesh->local_pm == pm)
446075d7 MP	158	return 0;
446075d7 MP	159
3f52b7e3 MP	160	mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
	161	pm, sta->sta.addr);
	162
433f5bc1	163	sta->mesh->local_pm = pm;
3f52b7e3 MP	164
	165	/*
	166	* announce peer-specific power mode transition
	167	* (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
	168	*/
433f5bc1	169	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
3f52b7e3 MP	170	mps_qos_null_tx(sta);
3f52b7e3 MP	171
39886b61	172	return ieee80211_mps_local_status_update(sdata);
3f52b7e3 MP	173	}
	174
	175	/**
	176	* ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
	177	*
	178	* @sdata: local mesh subif
	179	* @sta: mesh STA
	180	* @hdr: 802.11 frame header
	181	*
	182	* see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
	183	*
	184	* NOTE: sta must be given when an individually-addressed QoS frame header
	185	* is handled, for group-addressed and management frames it is not used
	186	*/
	187	void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
	188	struct sta_info *sta,
	189	struct ieee80211_hdr *hdr)
	190	{
	191	enum nl80211_mesh_power_mode pm;
	192	u8 *qc;
	193
	194	if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
	195	ieee80211_is_data_qos(hdr->frame_control) &&
	196	!sta))
	197	return;
	198
	199	if (is_unicast_ether_addr(hdr->addr1) &&
	200	ieee80211_is_data_qos(hdr->frame_control) &&
433f5bc1 JB	201	sta->mesh->plink_state == NL80211_PLINK_ESTAB)
433f5bc1 JB	202	pm = sta->mesh->local_pm;
3f52b7e3 MP	203	else
	204	pm = sdata->u.mesh.nonpeer_pm;
	205
	206	if (pm == NL80211_MESH_POWER_ACTIVE)
	207	hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
	208	else
	209	hdr->frame_control \|= cpu_to_le16(IEEE80211_FCTL_PM);
	210
	211	if (!ieee80211_is_data_qos(hdr->frame_control))
	212	return;
	213
	214	qc = ieee80211_get_qos_ctl(hdr);
	215
	216	if ((is_unicast_ether_addr(hdr->addr1) &&
	217	pm == NL80211_MESH_POWER_DEEP_SLEEP) \|\|
	218	(is_multicast_ether_addr(hdr->addr1) &&
	219	sdata->u.mesh.ps_peers_deep_sleep > 0))
	220	qc[1] \|= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
	221	else
	222	qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
	223	}
	224
	225	/**
	226	* ieee80211_mps_sta_status_update - update buffering status of neighbor STA
	227	*
	228	* @sta: mesh STA
	229	*
	230	* called after change of peering status or non-peer/peer-specific power mode
	231	*/
	232	void ieee80211_mps_sta_status_update(struct sta_info *sta)
	233	{
	234	enum nl80211_mesh_power_mode pm;
	235	bool do_buffer;
	236
40d18ff9 CYY	237	/* For non-assoc STA, prevent buffering or frame transmission */
	238	if (sta->sta_state < IEEE80211_STA_ASSOC)
	239	return;
	240
3f52b7e3 MP	241	/*
	242	* use peer-specific power mode if peering is established and the
	243	* peer's power mode is known
	244	*/
433f5bc1 JB	245	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
	246	sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
	247	pm = sta->mesh->peer_pm;
3f52b7e3	248	else
433f5bc1	249	pm = sta->mesh->nonpeer_pm;
3f52b7e3 MP	250
	251	do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
	252
446075d7	253	/* clear the MPSP flags for non-peers or active STA */
433f5bc1	254	if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
446075d7 MP	255	clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
	256	clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
	257	} else if (!do_buffer) {
	258	clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
	259	}
	260
3f52b7e3 MP	261	/* Don't let the same PS state be set twice */
	262	if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
	263	return;
	264
	265	if (do_buffer) {
	266	set_sta_flag(sta, WLAN_STA_PS_STA);
	267	atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
	268	mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
	269	sta->sta.addr);
	270	} else {
	271	ieee80211_sta_ps_deliver_wakeup(sta);
	272	}
3f52b7e3 MP	273	}
	274
	275	static void mps_set_sta_peer_pm(struct sta_info *sta,
	276	struct ieee80211_hdr *hdr)
	277	{
	278	enum nl80211_mesh_power_mode pm;
	279	u8 *qc = ieee80211_get_qos_ctl(hdr);
	280
	281	/*
	282	* Test Power Management field of frame control (PW) and
	283	* mesh power save level subfield of QoS control field (PSL)
	284	*
	285	* \| PM \| PSL\| Mesh PM \|
	286	* +----+----+---------+
	287	* \| 0 \|Rsrv\| Active \|
	288	* \| 1 \| 0 \| Light \|
	289	* \| 1 \| 1 \| Deep \|
	290	*/
	291	if (ieee80211_has_pm(hdr->frame_control)) {
	292	if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
	293	pm = NL80211_MESH_POWER_DEEP_SLEEP;
	294	else
	295	pm = NL80211_MESH_POWER_LIGHT_SLEEP;
	296	} else {
	297	pm = NL80211_MESH_POWER_ACTIVE;
	298	}
	299
433f5bc1	300	if (sta->mesh->peer_pm == pm)
3f52b7e3 MP	301	return;
	302
	303	mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
	304	sta->sta.addr, pm);
	305
433f5bc1	306	sta->mesh->peer_pm = pm;
3f52b7e3 MP	307
	308	ieee80211_mps_sta_status_update(sta);
	309	}
	310
	311	static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
	312	struct ieee80211_hdr *hdr)
	313	{
	314	enum nl80211_mesh_power_mode pm;
	315
	316	if (ieee80211_has_pm(hdr->frame_control))
	317	pm = NL80211_MESH_POWER_DEEP_SLEEP;
	318	else
	319	pm = NL80211_MESH_POWER_ACTIVE;
	320
433f5bc1	321	if (sta->mesh->nonpeer_pm == pm)
3f52b7e3 MP	322	return;
	323
	324	mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
	325	sta->sta.addr, pm);
	326
433f5bc1	327	sta->mesh->nonpeer_pm = pm;
3f52b7e3 MP	328
	329	ieee80211_mps_sta_status_update(sta);
	330	}
	331
	332	/**
	333	* ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
	334	*
	335	* @sta: STA info that transmitted the frame
	336	* @hdr: IEEE 802.11 (QoS) Header
	337	*/
	338	void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
	339	struct ieee80211_hdr *hdr)
	340	{
	341	if (is_unicast_ether_addr(hdr->addr1) &&
	342	ieee80211_is_data_qos(hdr->frame_control)) {
	343	/*
	344	* individually addressed QoS Data/Null frames contain
	345	* peer link-specific PS mode towards the local STA
	346	*/
	347	mps_set_sta_peer_pm(sta, hdr);
	348
	349	/* check for mesh Peer Service Period trigger frames */
	350	ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
	351	sta, false, false);
	352	} else {
	353	/*
	354	* can only determine non-peer PS mode
	355	* (see IEEE802.11-2012 8.2.4.1.7)
	356	*/
	357	mps_set_sta_nonpeer_pm(sta, hdr);
	358	}
	359	}
	360
	361
	362	/* mesh PS frame release */
	363
	364	static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
	365	{
	366	struct ieee80211_sub_if_data *sdata = sta->sdata;
	367	struct sk_buff *skb;
	368	struct ieee80211_hdr *nullfunc;
	369	struct ieee80211_tx_info *info;
	370	u8 *qc;
	371
	372	skb = mps_qos_null_get(sta);
	373	if (!skb)
	374	return;
	375
	376	nullfunc = (struct ieee80211_hdr *) skb->data;
	377	if (!eosp)
	378	nullfunc->frame_control \|=
	379	cpu_to_le16(IEEE80211_FCTL_MOREDATA);
	380	/*
	381	* \| RSPI \| EOSP \| MPSP triggering \|
	382	* +------+------+--------------------+
	383	* \| 0 \| 0 \| local STA is owner \|
	384	* \| 0 \| 1 \| no MPSP (MPSP end) \|
	385	* \| 1 \| 0 \| both STA are owner \|
	386	* \| 1 \| 1 \| peer STA is owner \| see IEEE802.11-2012 13.14.9.2
	387	*/
	388	qc = ieee80211_get_qos_ctl(nullfunc);
	389	if (rspi)
	390	qc[1] \|= (IEEE80211_QOS_CTL_RSPI >> 8);
	391	if (eosp)
392	qc[0] \|= IEEE80211_QOS_CTL_EOSP;
393
394	info = IEEE80211_SKB_CB(skb);
395
396	info->flags \|= IEEE80211_TX_CTL_NO_PS_BUFFER \|
397	IEEE80211_TX_CTL_REQ_TX_STATUS;
398
399	mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
400	rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
401
402	ieee80211_tx_skb(sdata, skb);
403	}
404
405	/**
406	* mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
21439b65 JB	407	* @sta: the station to handle
21439b65 JB	408	* @frames: the frame list to append to
3f52b7e3 MP	409	*
	410	* To properly end a mesh MPSP the last transmitted frame has to set the EOSP
	411	* flag in the QoS Control field. In case the current tailing frame is not a
	412	* QoS Data frame, append a QoS Null to carry the flag.
	413	*/
	414	static void mpsp_qos_null_append(struct sta_info *sta,
	415	struct sk_buff_head *frames)
	416	{
	417	struct ieee80211_sub_if_data *sdata = sta->sdata;
	418	struct sk_buff new_skb, skb = skb_peek_tail(frames);
	419	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	420	struct ieee80211_tx_info *info;
	421
	422	if (ieee80211_is_data_qos(hdr->frame_control))
	423	return;
	424
	425	new_skb = mps_qos_null_get(sta);
	426	if (!new_skb)
	427	return;
	428
	429	mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
	430	sta->sta.addr);
	431	/*
	432	* This frame has to be transmitted last. Assign lowest priority to
	433	* make sure it cannot pass other frames when releasing multiple ACs.
	434	*/
	435	new_skb->priority = 1;
	436	skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
	437	ieee80211_set_qos_hdr(sdata, new_skb);
	438
	439	info = IEEE80211_SKB_CB(new_skb);
	440	info->control.vif = &sdata->vif;
cc20ff2c	441	info->control.flags \|= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
3f52b7e3 MP	442
	443	__skb_queue_tail(frames, new_skb);
	444	}
	445
	446	/**
	447	* mps_frame_deliver - transmit frames during mesh powersave
	448	*
	449	* @sta: STA info to transmit to
	450	* @n_frames: number of frames to transmit. -1 for all
	451	*/
	452	static void mps_frame_deliver(struct sta_info *sta, int n_frames)
	453	{
446075d7	454	struct ieee80211_local *local = sta->sdata->local;
3f52b7e3 MP	455	int ac;
	456	struct sk_buff_head frames;
	457	struct sk_buff *skb;
	458	bool more_data = false;
	459
	460	skb_queue_head_init(&frames);
	461
	462	/* collect frame(s) from buffers */
	463	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
	464	while (n_frames != 0) {
	465	skb = skb_dequeue(&sta->tx_filtered[ac]);
	466	if (!skb) {
	467	skb = skb_dequeue(
	468	&sta->ps_tx_buf[ac]);
	469	if (skb)
	470	local->total_ps_buffered--;
	471	}
	472	if (!skb)
	473	break;
	474	n_frames--;
	475	__skb_queue_tail(&frames, skb);
	476	}
	477
	478	if (!skb_queue_empty(&sta->tx_filtered[ac]) \|\|
	479	!skb_queue_empty(&sta->ps_tx_buf[ac]))
	480	more_data = true;
	481	}
	482
	483	/* nothing to send? -> EOSP */
	484	if (skb_queue_empty(&frames)) {
	485	mpsp_trigger_send(sta, false, true);
	486	return;
	487	}
	488
	489	/* in a MPSP make sure the last skb is a QoS Data frame */
	490	if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
	491	mpsp_qos_null_append(sta, &frames);
	492
	493	mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
	494	skb_queue_len(&frames), sta->sta.addr);
	495
	496	/* prepare collected frames for transmission */
	497	skb_queue_walk(&frames, skb) {
	498	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	499	struct ieee80211_hdr hdr = (void ) skb->data;
	500
	501	/*
	502	* Tell TX path to send this frame even though the
	503	* STA may still remain is PS mode after this frame
	504	* exchange.
	505	*/
	506	info->flags \|= IEEE80211_TX_CTL_NO_PS_BUFFER;
	507
	508	if (more_data \|\| !skb_queue_is_last(&frames, skb))
	509	hdr->frame_control \|=
	510	cpu_to_le16(IEEE80211_FCTL_MOREDATA);
	511	else
	512	hdr->frame_control &=
	513	cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
	514
	515	if (skb_queue_is_last(&frames, skb) &&
	516	ieee80211_is_data_qos(hdr->frame_control)) {
	517	u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
	518
519	/* MPSP trigger frame ends service period */
520	*qoshdr \|= IEEE80211_QOS_CTL_EOSP;
521	info->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
522	}
523	}
524
525	ieee80211_add_pending_skbs(local, &frames);
526	sta_info_recalc_tim(sta);
527	}
528
529	/**
530	* ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
531	*
532	* @qc: QoS Control field
533	* @sta: peer to start a MPSP with
534	* @tx: frame was transmitted by the local STA
535	* @acked: frame has been transmitted successfully
536	*
537	* NOTE: active mode STA may only serve as MPSP owner
538	*/
539	void ieee80211_mpsp_trigger_process(u8 qc, struct sta_info sta,
540	bool tx, bool acked)
541	{
542	u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
543	u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
544
545	if (tx) {
546	if (rspi && acked)
547	set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
548
549	if (eosp)
550	clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
551	else if (acked &&
552	test_sta_flag(sta, WLAN_STA_PS_STA) &&
553	!test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
554	mps_frame_deliver(sta, -1);
555	} else {
556	if (eosp)
557	clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
433f5bc1	558	else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
3f52b7e3 MP	559	set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
	560
	561	if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
	562	mps_frame_deliver(sta, -1);
	563	}
	564	}
	565
	566	/**
446075d7	567	* ieee80211_mps_frame_release - release frames buffered due to mesh power save
3f52b7e3 MP	568	*
3f52b7e3 MP	569	* @sta: mesh STA
446075d7	570	* @elems: IEs of beacon or probe response
3f52b7e3 MP	571	*
	572	* For peers if we have individually-addressed frames buffered or the peer
	573	* indicates buffered frames, send a corresponding MPSP trigger frame. Since
	574	* we do not evaluate the awake window duration, QoS Nulls are used as MPSP
	575	* trigger frames. If the neighbour STA is not a peer, only send single frames.
	576	*/
	577	void ieee80211_mps_frame_release(struct sta_info *sta,
	578	struct ieee802_11_elems *elems)
	579	{
	580	int ac, buffer_local = 0;
	581	bool has_buffered = false;
	582
433f5bc1	583	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
3f52b7e3	584	has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
a69bd8e6	585	sta->mesh->aid);
3f52b7e3 MP	586
	587	if (has_buffered)
	588	mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
	589	sta->sta.addr);
	590
	591	/* only transmit to PS STA with announced, non-zero awake window */
	592	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
b9731062	593	(!elems->awake_window \|\| !get_unaligned_le16(elems->awake_window)))
3f52b7e3 MP	594	return;
3f52b7e3 MP	595
446075d7 MP	596	if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
	597	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
	598	buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
	599	skb_queue_len(&sta->tx_filtered[ac]);
3f52b7e3 MP	600
	601	if (!has_buffered && !buffer_local)
	602	return;
	603
433f5bc1	604	if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
3f52b7e3 MP	605	mpsp_trigger_send(sta, has_buffered, !buffer_local);
	606	else
	607	mps_frame_deliver(sta, 1);
	608	}